To use a FG you must use a Heavy Dropsuit. The Heavy Dropsuit is by far the Easiest dropsuit to counter in the game because of our very large hitbox and very slow Movement/Sprint Speed.

FG (and other) Heavies require intensive squad support in the form of nanohives, armor repair, and nanite injectors in order to be mildly effective in any battle situation.

Once in CQC the FG is useless. This limits the Heavy to a side arm, making him extremely vulnerable to enemy attack.

The Tower Forge Gunner complaint is the most common. People complain because "they are on a high tower and don't render" Seriously guys how many towers exist in this game that are only accessible with dropships? It is not that difficult to figure out where their perch is. Once located it is not difficult to use some elementary squad coordination to take them out.

Solo Tower FG heavies can easily be countered by a Medium or Light Suit team of two. One with an active scanner and shotgun or AR or nearly any other Handheld light weapon in the game another with a sniper rifle or *gasp* Heavy with a FG. If the Heavy is on a tower with no ladder Squad Coordination can be used to easily locate the Heavy for snipers to focus fire and nullify the threat. A dropship should be in position at flight ceiling over the tower to then land on the tower and remove any uplinks or nanohives. Even the Tac AR can easily take out a Tower FG Heavy from the ground.

Feel free to add more reasons why the FG is not Overpowered.

For some of the towers yes the TAC can hit, so can the standard AR. Not the tallest towers, no, but most of the ones with ladders.

I didn't say take them out with a DS I said have your DS in position over the tower at the flight ceiling waiting for your team to take him out then land on the tower and take out the uplinks and nanohives.